Monthly Archives: January 2014

Volume changes on melting

For most crystalline solids (in which the atoms/ions/molecules are packed tightly), we expect the density to fall on melting. This is somewhat easy to see for elemental metals. For example, the density of fcc Al falls from 2.7 g/cc to … Continue reading

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Freezing Water

You can start with beautiful, almost mesmerizing pictures of freezing of bubble walls in Angela Kelly’s photo set at Flickr. Here’s a pretty nice video of freezing of soap bubbles at an ambient temperature of -33 degrees Celsius. [You might … Continue reading

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Symmetric and Reversible

One of the popular ways of describing an irreversible process is to show a movie, and then run it in reverse. Evidently, it feels so wrong when it runs backwards, and therefore, … Entropy! A palindromic short film that is … Continue reading

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